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Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
62
GRADE
D
FIX
3
REVIEW
2
PASS
1
INFO
0
Device:
Mobile Desktop
Checks
6
1 PASS 2 REVIEW 3 FIX
D
CO2 Per Page Load
Action
1.48g CO2 per view
FIX
1.48g CO2 per view
Warning::
1.48g CO2 per page view
This page transfers 5.2 MB, producing an estimated 1.48g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.27g, network 0.26g, end-user device 0.95g.
Got: 1.48g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 177.6 kg CO2/year
With 10,000 page views per month, this page would generate approximately 177.6 kg of CO2 annually — equivalent to charging 22195 smartphones.

1.48g

Carbon Footprint per page view

✗ Above sustainability target (0.50g)

Cleaner than 25% of websites

Sustainable Web Design model v4 · Page size: 5.2 MB

Your site
1.48g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.27g
Network
0.26g
End-user device
0.95g
At 10,000 monthly views: Monthly: 14.8 kg · Annual: 177.6 kg · ≈ 22195 smartphone charges
D
Green Hosting
Action
Unknown
FIX
Unknown
Info::
Hosting provider could not be identified
Without knowing the provider, we cannot determine their energy sourcing. Check with your hosting provider about their renewable energy commitments.
Info::
Green hosting status based on known provider commitments
Green hosting detection uses a curated database of provider renewable energy commitments. This is not a real-time verification. For authoritative checks, visit thegreenwebfoundation.org.
Green HostingUnable to Determine
Hosting Not identified✗CDN Not identified✗

Based on known provider commitments. Verify at thegreenwebfoundation.org

F
Carbon Budget
Action
75th percentile
FIX
75th percentile
Warning::
1.48g CO2 — above the median website (0.60g)
Heavier than an estimated 25% of websites. Reducing page weight, optimizing images, and removing unused JavaScript would lower the carbon footprint. See the Performance tab.
Info::
Estimated 75th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

1.48g

75th percentile

Cleaner than 25% of websites

✗ Above the median website

vs Median 147% more
vs Target 196% more
B
Transfer Efficiency
89% efficient
REVIEW
89% efficient
Info::
Transfer efficiency: 89%
An estimated 584 KB (11%) could be eliminated: 0 KB via better compression, 0 KB via modern image formats, 584 KB of unused JavaScript. This wasted data produces 0.16g of unnecessary CO2 per page view.
89% efficient

Total waste: 584 KB (11% of page weight)

Unused JS 584 KB

0.16g unnecessary CO2 per visit

Actual transfer 5350 KB
Theoretical minimum 4765 KB
Potential savings 584 KB (0.16g CO2)

See Deep Analysis sections above for specific optimizations.

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Repeat Visit Weight
100% cached
PASS
100% cached
Info::
100% reduction on repeat visits
Returning visitors download only 17 KB (vs 5350 KB first visit). 79 of 80 resources are served from browser cache, saving 1.47g CO2 per repeat visit.
Info::
Repeat visit: 0.00g CO2 (first visit: 1.48g)
First visit
5350 KB
Repeat visit
17 KB

100% reduction on repeat visits

Saving 1.47g CO2 per returning visitor

79 resources served from cache · 1 resources re-downloaded

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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